Ocean

Extremely detailed Cambrian fossils show that enigmatic skeleton tubes belonged to ancient ancestors of modern jellyfish.

Light-up fish and ancient volcanic structures are among the discoveries of a new expedition to map the remote Cocos Islands in the Indian Ocean.

Watch debris from the sea bottom fly, as octopuses hurl sand and other projectiles at their neighbors in an Australian bay.

Researchers estimate that blue whales may each consume up to 10 million pieces of microplastic every day during their main feeding season as they chow down on plastic-filled prey.

Here are the measurements for the deepest depths in each of the world's five oceans, and a look at the unique animals that live in these deep zones.

The subterranean structures could provide clues about how modern ice sheets will react to climate change.

Researchers exploring the deep sea in the Caribbean have come across a mysterious "blue goo" that they can't identify.

An astronaut recently captured a stunning image of a "sunglint" that transformed the sea surrounding two Greek islands into a swirling silver mirror.

A dead giant squid has washed up on a beach at a nature reserve in New Zealand. A group of tourists was lucky enough to see the body up close.

A megalodon tooth found suspiciously close to two fractured whale vertebrae may reflect one small whale's heroic escape from the jaws of a giant prehistoric shark.

Local news reports suggest that unusually large swarms tiny foot-biting isopods on beaches around San Diego are leading to a greater number of toes being chomped on.

Epaulette sharks can use their fins to "walk" underwater and even on dry land.

Dugongs, or sea cows, which are thought to have inspired tales of mythical mermaids, haven't been seen in Chinese waters since 2000.

Scientists found a huge field of hydrothermal vents on the East Pacific Rise.

A new video released by the Monterey Bay Aquarium Research Institute (MBARI) shows off 2012 footage of an unnamed species of spaghetti worm.

Cameras on drones recently captured aerial images of nomad jellyfish as they swarmed by the thousands in coastal waters near Israel.

Researchers captured a rare flower-like sea pen on video in the deep sea and believe it could be a new species.

Scientists recently discovered rare brine pools — dense, salty depressions — at the bottom of the Red Sea, where microbes thrive under extreme conditions.

The mesmerizing footage was captured more than 4,500 feet below the sea surface.

The gelatinous fish also has a strange suction cup on its belly.